The circular house -- ultramodern when it was built -- is ringed with small square windows and directional lights and perched on six "landing gear" legs. It has multiple levels, three bedrooms, two baths and an entrance staircase that retracts with the push of a button.
Terry Posey, an agent with Crye-Leike Auctions of Cleveland, Tenn., said the current owner has had the property only four months and didn't want to comment. Posey posted an e-Bay ad and said he already has a $100,000 bid.
John Kleeman of Litchfield, Conn., an attorney and space culture enthusiast, said he knows of variations of the flying saucer design in Florida, Connecticut and California.
The flying saucer designs popped up about the time of the moon landings. "That's when all the excitement was," Kleeman said.
The Chattanooga home's unusual shape -- sort of like two white Frisbees pasted together -- poses some interior decorating challenges. The curve of the exterior creates a sloping ceiling and short side walls, but there's also a striking curved bar and a custom bathtub.
The house is larger than the prefabricated and movable UFO-shaped structures, known as Futuro houses, designed by Finnish architect Matti Suuronen in 1968.
"It really looked like a spaceship ready to take off," said realtor Lois Killebrew, who handled an open house at the first sale of the Chattanooga home decades ago.
The late Curtis W. King and his family built the unusual home because "they liked to do unusual things," Killebrew said.